/*
 * Copyright (c) 1997, 2006, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
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 *
 *
 */

package java.awt.geom;

import java.io.Serializable;

/**
 * The <code>RoundRectangle2D</code> class defines a rectangle with
 * rounded corners defined by a location {@code (x,y)}, a
 * dimension {@code (w x h)}, and the width and height of an arc
 * with which to round the corners.
 * <p>
 * This class is the abstract superclass for all objects that
 * store a 2D rounded rectangle.
 * The actual storage representation of the coordinates is left to
 * the subclass.
 *
 * @author Jim Graham
 * @since 1.2
 */
public abstract class RoundRectangle2D extends RectangularShape {

  /**
   * The <code>Float</code> class defines a rectangle with rounded
   * corners all specified in <code>float</code> coordinates.
   *
   * @since 1.2
   */
  public static class Float extends RoundRectangle2D
      implements Serializable {

    /**
     * The X coordinate of this <code>RoundRectangle2D</code>.
     *
     * @serial
     * @since 1.2
     */
    public float x;

    /**
     * The Y coordinate of this <code>RoundRectangle2D</code>.
     *
     * @serial
     * @since 1.2
     */
    public float y;

    /**
     * The width of this <code>RoundRectangle2D</code>.
     *
     * @serial
     * @since 1.2
     */
    public float width;

    /**
     * The height of this <code>RoundRectangle2D</code>.
     *
     * @serial
     * @since 1.2
     */
    public float height;

    /**
     * The width of the arc that rounds off the corners.
     *
     * @serial
     * @since 1.2
     */
    public float arcwidth;

    /**
     * The height of the arc that rounds off the corners.
     *
     * @serial
     * @since 1.2
     */
    public float archeight;

    /**
     * Constructs a new <code>RoundRectangle2D</code>, initialized to
     * location (0.0,&nbsp;0.0), size (0.0,&nbsp;0.0), and corner arcs
     * of radius 0.0.
     *
     * @since 1.2
     */
    public Float() {
    }

    /**
     * Constructs and initializes a <code>RoundRectangle2D</code>
     * from the specified <code>float</code> coordinates.
     *
     * @param x the X coordinate of the newly constructed <code>RoundRectangle2D</code>
     * @param y the Y coordinate of the newly constructed <code>RoundRectangle2D</code>
     * @param w the width to which to set the newly constructed <code>RoundRectangle2D</code>
     * @param h the height to which to set the newly constructed <code>RoundRectangle2D</code>
     * @param arcw the width of the arc to use to round off the corners of the newly constructed
     * <code>RoundRectangle2D</code>
     * @param arch the height of the arc to use to round off the corners of the newly constructed
     * <code>RoundRectangle2D</code>
     * @since 1.2
     */
    public Float(float x, float y, float w, float h,
        float arcw, float arch) {
      setRoundRect(x, y, w, h, arcw, arch);
    }

    /**
     * {@inheritDoc}
     *
     * @since 1.2
     */
    public double getX() {
      return (double) x;
    }

    /**
     * {@inheritDoc}
     *
     * @since 1.2
     */
    public double getY() {
      return (double) y;
    }

    /**
     * {@inheritDoc}
     *
     * @since 1.2
     */
    public double getWidth() {
      return (double) width;
    }

    /**
     * {@inheritDoc}
     *
     * @since 1.2
     */
    public double getHeight() {
      return (double) height;
    }

    /**
     * {@inheritDoc}
     *
     * @since 1.2
     */
    public double getArcWidth() {
      return (double) arcwidth;
    }

    /**
     * {@inheritDoc}
     *
     * @since 1.2
     */
    public double getArcHeight() {
      return (double) archeight;
    }

    /**
     * {@inheritDoc}
     *
     * @since 1.2
     */
    public boolean isEmpty() {
      return (width <= 0.0f) || (height <= 0.0f);
    }

    /**
     * Sets the location, size, and corner radii of this
     * <code>RoundRectangle2D</code> to the specified
     * <code>float</code> values.
     *
     * @param x the X coordinate to which to set the location of this <code>RoundRectangle2D</code>
     * @param y the Y coordinate to which to set the location of this <code>RoundRectangle2D</code>
     * @param w the width to which to set this <code>RoundRectangle2D</code>
     * @param h the height to which to set this <code>RoundRectangle2D</code>
     * @param arcw the width to which to set the arc of this <code>RoundRectangle2D</code>
     * @param arch the height to which to set the arc of this <code>RoundRectangle2D</code>
     * @since 1.2
     */
    public void setRoundRect(float x, float y, float w, float h,
        float arcw, float arch) {
      this.x = x;
      this.y = y;
      this.width = w;
      this.height = h;
      this.arcwidth = arcw;
      this.archeight = arch;
    }

    /**
     * {@inheritDoc}
     *
     * @since 1.2
     */
    public void setRoundRect(double x, double y, double w, double h,
        double arcw, double arch) {
      this.x = (float) x;
      this.y = (float) y;
      this.width = (float) w;
      this.height = (float) h;
      this.arcwidth = (float) arcw;
      this.archeight = (float) arch;
    }

    /**
     * {@inheritDoc}
     *
     * @since 1.2
     */
    public void setRoundRect(RoundRectangle2D rr) {
      this.x = (float) rr.getX();
      this.y = (float) rr.getY();
      this.width = (float) rr.getWidth();
      this.height = (float) rr.getHeight();
      this.arcwidth = (float) rr.getArcWidth();
      this.archeight = (float) rr.getArcHeight();
    }

    /**
     * {@inheritDoc}
     *
     * @since 1.2
     */
    public Rectangle2D getBounds2D() {
      return new Rectangle2D.Float(x, y, width, height);
    }

    /*
     * JDK 1.6 serialVersionUID
     */
    private static final long serialVersionUID = -3423150618393866922L;
  }

  /**
   * The <code>Double</code> class defines a rectangle with rounded
   * corners all specified in <code>double</code> coordinates.
   *
   * @since 1.2
   */
  public static class Double extends RoundRectangle2D
      implements Serializable {

    /**
     * The X coordinate of this <code>RoundRectangle2D</code>.
     *
     * @serial
     * @since 1.2
     */
    public double x;

    /**
     * The Y coordinate of this <code>RoundRectangle2D</code>.
     *
     * @serial
     * @since 1.2
     */
    public double y;

    /**
     * The width of this <code>RoundRectangle2D</code>.
     *
     * @serial
     * @since 1.2
     */
    public double width;

    /**
     * The height of this <code>RoundRectangle2D</code>.
     *
     * @serial
     * @since 1.2
     */
    public double height;

    /**
     * The width of the arc that rounds off the corners.
     *
     * @serial
     * @since 1.2
     */
    public double arcwidth;

    /**
     * The height of the arc that rounds off the corners.
     *
     * @serial
     * @since 1.2
     */
    public double archeight;

    /**
     * Constructs a new <code>RoundRectangle2D</code>, initialized to
     * location (0.0,&nbsp;0.0), size (0.0,&nbsp;0.0), and corner arcs
     * of radius 0.0.
     *
     * @since 1.2
     */
    public Double() {
    }

    /**
     * Constructs and initializes a <code>RoundRectangle2D</code>
     * from the specified <code>double</code> coordinates.
     *
     * @param x the X coordinate of the newly constructed <code>RoundRectangle2D</code>
     * @param y the Y coordinate of the newly constructed <code>RoundRectangle2D</code>
     * @param w the width to which to set the newly constructed <code>RoundRectangle2D</code>
     * @param h the height to which to set the newly constructed <code>RoundRectangle2D</code>
     * @param arcw the width of the arc to use to round off the corners of the newly constructed
     * <code>RoundRectangle2D</code>
     * @param arch the height of the arc to use to round off the corners of the newly constructed
     * <code>RoundRectangle2D</code>
     * @since 1.2
     */
    public Double(double x, double y, double w, double h,
        double arcw, double arch) {
      setRoundRect(x, y, w, h, arcw, arch);
    }

    /**
     * {@inheritDoc}
     *
     * @since 1.2
     */
    public double getX() {
      return x;
    }

    /**
     * {@inheritDoc}
     *
     * @since 1.2
     */
    public double getY() {
      return y;
    }

    /**
     * {@inheritDoc}
     *
     * @since 1.2
     */
    public double getWidth() {
      return width;
    }

    /**
     * {@inheritDoc}
     *
     * @since 1.2
     */
    public double getHeight() {
      return height;
    }

    /**
     * {@inheritDoc}
     *
     * @since 1.2
     */
    public double getArcWidth() {
      return arcwidth;
    }

    /**
     * {@inheritDoc}
     *
     * @since 1.2
     */
    public double getArcHeight() {
      return archeight;
    }

    /**
     * {@inheritDoc}
     *
     * @since 1.2
     */
    public boolean isEmpty() {
      return (width <= 0.0f) || (height <= 0.0f);
    }

    /**
     * {@inheritDoc}
     *
     * @since 1.2
     */
    public void setRoundRect(double x, double y, double w, double h,
        double arcw, double arch) {
      this.x = x;
      this.y = y;
      this.width = w;
      this.height = h;
      this.arcwidth = arcw;
      this.archeight = arch;
    }

    /**
     * {@inheritDoc}
     *
     * @since 1.2
     */
    public void setRoundRect(RoundRectangle2D rr) {
      this.x = rr.getX();
      this.y = rr.getY();
      this.width = rr.getWidth();
      this.height = rr.getHeight();
      this.arcwidth = rr.getArcWidth();
      this.archeight = rr.getArcHeight();
    }

    /**
     * {@inheritDoc}
     *
     * @since 1.2
     */
    public Rectangle2D getBounds2D() {
      return new Rectangle2D.Double(x, y, width, height);
    }

    /*
     * JDK 1.6 serialVersionUID
     */
    private static final long serialVersionUID = 1048939333485206117L;
  }

  /**
   * This is an abstract class that cannot be instantiated directly.
   * Type-specific implementation subclasses are available for
   * instantiation and provide a number of formats for storing
   * the information necessary to satisfy the various accessor
   * methods below.
   *
   * @see java.awt.geom.RoundRectangle2D.Float
   * @see java.awt.geom.RoundRectangle2D.Double
   * @since 1.2
   */
  protected RoundRectangle2D() {
  }

  /**
   * Gets the width of the arc that rounds off the corners.
   *
   * @return the width of the arc that rounds off the corners of this <code>RoundRectangle2D</code>.
   * @since 1.2
   */
  public abstract double getArcWidth();

  /**
   * Gets the height of the arc that rounds off the corners.
   *
   * @return the height of the arc that rounds off the corners of this <code>RoundRectangle2D</code>.
   * @since 1.2
   */
  public abstract double getArcHeight();

  /**
   * Sets the location, size, and corner radii of this
   * <code>RoundRectangle2D</code> to the specified
   * <code>double</code> values.
   *
   * @param x the X coordinate to which to set the location of this <code>RoundRectangle2D</code>
   * @param y the Y coordinate to which to set the location of this <code>RoundRectangle2D</code>
   * @param w the width to which to set this <code>RoundRectangle2D</code>
   * @param h the height to which to set this <code>RoundRectangle2D</code>
   * @param arcWidth the width to which to set the arc of this <code>RoundRectangle2D</code>
   * @param arcHeight the height to which to set the arc of this <code>RoundRectangle2D</code>
   * @since 1.2
   */
  public abstract void setRoundRect(double x, double y, double w, double h,
      double arcWidth, double arcHeight);

  /**
   * Sets this <code>RoundRectangle2D</code> to be the same as the
   * specified <code>RoundRectangle2D</code>.
   *
   * @param rr the specified <code>RoundRectangle2D</code>
   * @since 1.2
   */
  public void setRoundRect(RoundRectangle2D rr) {
    setRoundRect(rr.getX(), rr.getY(), rr.getWidth(), rr.getHeight(),
        rr.getArcWidth(), rr.getArcHeight());
  }

  /**
   * {@inheritDoc}
   *
   * @since 1.2
   */
  public void setFrame(double x, double y, double w, double h) {
    setRoundRect(x, y, w, h, getArcWidth(), getArcHeight());
  }

  /**
   * {@inheritDoc}
   *
   * @since 1.2
   */
  public boolean contains(double x, double y) {
    if (isEmpty()) {
      return false;
    }
    double rrx0 = getX();
    double rry0 = getY();
    double rrx1 = rrx0 + getWidth();
    double rry1 = rry0 + getHeight();
    // Check for trivial rejection - point is outside bounding rectangle
    if (x < rrx0 || y < rry0 || x >= rrx1 || y >= rry1) {
      return false;
    }
    double aw = Math.min(getWidth(), Math.abs(getArcWidth())) / 2.0;
    double ah = Math.min(getHeight(), Math.abs(getArcHeight())) / 2.0;
    // Check which corner point is in and do circular containment
    // test - otherwise simple acceptance
    if (x >= (rrx0 += aw) && x < (rrx0 = rrx1 - aw)) {
      return true;
    }
    if (y >= (rry0 += ah) && y < (rry0 = rry1 - ah)) {
      return true;
    }
    x = (x - rrx0) / aw;
    y = (y - rry0) / ah;
    return (x * x + y * y <= 1.0);
  }

  private int classify(double coord, double left, double right,
      double arcsize) {
    if (coord < left) {
      return 0;
    } else if (coord < left + arcsize) {
      return 1;
    } else if (coord < right - arcsize) {
      return 2;
    } else if (coord < right) {
      return 3;
    } else {
      return 4;
    }
  }

  /**
   * {@inheritDoc}
   *
   * @since 1.2
   */
  public boolean intersects(double x, double y, double w, double h) {
    if (isEmpty() || w <= 0 || h <= 0) {
      return false;
    }
    double rrx0 = getX();
    double rry0 = getY();
    double rrx1 = rrx0 + getWidth();
    double rry1 = rry0 + getHeight();
    // Check for trivial rejection - bounding rectangles do not intersect
    if (x + w <= rrx0 || x >= rrx1 || y + h <= rry0 || y >= rry1) {
      return false;
    }
    double aw = Math.min(getWidth(), Math.abs(getArcWidth())) / 2.0;
    double ah = Math.min(getHeight(), Math.abs(getArcHeight())) / 2.0;
    int x0class = classify(x, rrx0, rrx1, aw);
    int x1class = classify(x + w, rrx0, rrx1, aw);
    int y0class = classify(y, rry0, rry1, ah);
    int y1class = classify(y + h, rry0, rry1, ah);
    // Trivially accept if any point is inside inner rectangle
    if (x0class == 2 || x1class == 2 || y0class == 2 || y1class == 2) {
      return true;
    }
    // Trivially accept if either edge spans inner rectangle
    if ((x0class < 2 && x1class > 2) || (y0class < 2 && y1class > 2)) {
      return true;
    }
    // Since neither edge spans the center, then one of the corners
    // must be in one of the rounded edges.  We detect this case if
    // a [xy]0class is 3 or a [xy]1class is 1.  One of those two cases
    // must be true for each direction.
    // We now find a "nearest point" to test for being inside a rounded
    // corner.
    x = (x1class == 1) ? (x = x + w - (rrx0 + aw)) : (x = x - (rrx1 - aw));
    y = (y1class == 1) ? (y = y + h - (rry0 + ah)) : (y = y - (rry1 - ah));
    x = x / aw;
    y = y / ah;
    return (x * x + y * y <= 1.0);
  }

  /**
   * {@inheritDoc}
   *
   * @since 1.2
   */
  public boolean contains(double x, double y, double w, double h) {
    if (isEmpty() || w <= 0 || h <= 0) {
      return false;
    }
    return (contains(x, y) &&
        contains(x + w, y) &&
        contains(x, y + h) &&
        contains(x + w, y + h));
  }

  /**
   * Returns an iteration object that defines the boundary of this
   * <code>RoundRectangle2D</code>.
   * The iterator for this class is multi-threaded safe, which means
   * that this <code>RoundRectangle2D</code> class guarantees that
   * modifications to the geometry of this <code>RoundRectangle2D</code>
   * object do not affect any iterations of that geometry that
   * are already in process.
   *
   * @param at an optional <code>AffineTransform</code> to be applied to the coordinates as they are
   * returned in the iteration, or <code>null</code> if untransformed coordinates are desired
   * @return the <code>PathIterator</code> object that returns the geometry of the outline of this
   * <code>RoundRectangle2D</code>, one segment at a time.
   * @since 1.2
   */
  public PathIterator getPathIterator(AffineTransform at) {
    return new RoundRectIterator(this, at);
  }

  /**
   * Returns the hashcode for this <code>RoundRectangle2D</code>.
   *
   * @return the hashcode for this <code>RoundRectangle2D</code>.
   * @since 1.6
   */
  public int hashCode() {
    long bits = java.lang.Double.doubleToLongBits(getX());
    bits += java.lang.Double.doubleToLongBits(getY()) * 37;
    bits += java.lang.Double.doubleToLongBits(getWidth()) * 43;
    bits += java.lang.Double.doubleToLongBits(getHeight()) * 47;
    bits += java.lang.Double.doubleToLongBits(getArcWidth()) * 53;
    bits += java.lang.Double.doubleToLongBits(getArcHeight()) * 59;
    return (((int) bits) ^ ((int) (bits >> 32)));
  }

  /**
   * Determines whether or not the specified <code>Object</code> is
   * equal to this <code>RoundRectangle2D</code>.  The specified
   * <code>Object</code> is equal to this <code>RoundRectangle2D</code>
   * if it is an instance of <code>RoundRectangle2D</code> and if its
   * location, size, and corner arc dimensions are the same as this
   * <code>RoundRectangle2D</code>.
   *
   * @param obj an <code>Object</code> to be compared with this <code>RoundRectangle2D</code>.
   * @return <code>true</code> if <code>obj</code> is an instance of <code>RoundRectangle2D</code>
   * and has the same values; <code>false</code> otherwise.
   * @since 1.6
   */
  public boolean equals(Object obj) {
    if (obj == this) {
      return true;
    }
    if (obj instanceof RoundRectangle2D) {
      RoundRectangle2D rr2d = (RoundRectangle2D) obj;
      return ((getX() == rr2d.getX()) &&
          (getY() == rr2d.getY()) &&
          (getWidth() == rr2d.getWidth()) &&
          (getHeight() == rr2d.getHeight()) &&
          (getArcWidth() == rr2d.getArcWidth()) &&
          (getArcHeight() == rr2d.getArcHeight()));
    }
    return false;
  }
}
